Windshield wiper



June 28, 1921.

" H. E. MARSH WINE-SHIELD WIPER Filed Sept. 7, 1926 glnvcnfot Howard f. Marsh Patented June 28, 1927.

HOWARD n.

xv -Assn, or Lomoc, cnmronma.

, wmnsmnnn wuss,

Application filed September 7., 1326. Serial No. 134,021,.

This invention relates to windshield Wipers of the type employed, for example, for removing'moisture and dust from windshields o'f motor cars.

n. ject f he vent o is t e e a reciprocating motion of the wiper bar lengthwise of the windshield so as to clean substantially the surface of the windshield the fulllength thereof. f

other object isto efi'ect the reciproeating motion of the wiper bar by the, use of a nor'r-ieversingmotor.

Another object is. to provide a construction which can readily be adapted to windshieldsot dii ferentlengths.

Further objects and advantages will appear in the subjoined detailed description.

Th" accon panylng drawings illustrate the inventio'ni I i Fi ure l 'is a front view of a windshield wiper constructed in accordance with the provisions of this invention, the same being shown mounted upon' the windshield of a motorcar. The shaft housing is partly br n weyf Figure -2 is an enlarged edge View of the windshield wiper from the right in Figure 1, the motor car parts being indicated in dotted lines.

Figure 3 is an enlarged fragmental view of the screw shaft and the shoe."

igure 4 is an enlarged broken lon ltudinal viewl of'the'screw shaft witl t e trayeling member and worm gear thereon,

the worm operating said gear also being shown.

Figure 5. is an. enlarged sectional View on the line indicated by 555, Figure 1, some of the parts also being in section on the line 55, Figure 4.

Referrin to the drawings, a screw shaft is indicatec at 6 and is rotated by'a worm gear 7. The screw shaftis made with a double thread, a. right hand thread 8 and a left hand thread 9, the two threads being connected at suitable points by a return groove 10. In this particular instance, the shaft 6 is of sectional construct-ion in order that it may be made of suitable lengths for various lengths of Windshields. For example, in the instance shown, there are longer threaded sections 1 1, shorter threaded sections 12, a coupling section 13, and end sections 14, 15. The shaft is hollow, in this instance, and the sections are secured together at the joints by pins 16 m the bore of the shaft extending across the joint, and taper pins 17 driven through the shaft into the pins 16. i

In'this particular instance, the. couplin section 13 forms at its opposite ends two o thereturn grooves IQ and end sections 14, 15 are also 'ea'ch provided with one of the return grooves. On the screw shaft 6 is one 'or more travcling members 18 which, in this" instance, is in the form of asleeve. Though one trax' elihg' member may be employed "to travel from end to end of the screw-threads e'f'the shaft, it maybe preferable in some instances to provide a plurality of said members, as shown, one to travel alon half of the length of the windshield "am: the other'to travel along the other half.

Within each of the members l8 is a shoe 19 adapted to ride in the 'screw-threadsfi,

'9. The shoe is longer than the width of the thread so as to traclr properly in the thread, and projecting outwardly from each shoe is a stud 2Qwhich projects into 'a socket 21 in the member 18 To each member 18 is secured an arm 22 carrying a wiper bar'23 of any well known preferred construction. stance, each wi q eeze he r (ligated a 24 and contacting with the windshield which is indicated at A."

Ech stud 20 is mounted to turn in a bushing 23 the socket 21 said bushing constituting theb'earing for the stud so that the shoe '19 can turn onv exis as it tracks the return grooves 10.

Each arm 22 is guided and, for this purpose, said arm projects through a slot 24 n alongitudihelly extending guide 25. In this instance, the guide 25 is cylindrical and constitutes a housing for the shaft.

thusrev nti g the entrance of dirt to the er bar 23 constitutes a er strip thereof being insc rew thre'adsfsaid" housing extending from end to end 01 the shaft: The edges of'the slots 24 are provided with sealing members 26 to seal the slot, said members being made of felt, for example, and having their adjacent edges substantially in contact exthe slot 24. The housing 25 is attached by upper frame member B of the windshield A.

The worm gear 7 is operated by a worm 28 on the shaft 29 of a rotary motor 30.

This motor is not illustrated and d s ribed In this inin detail herein as the construction thereof is well understood in the art relating to vacuum operated windshield wipers. It sufiices to state that the vacuum of the motor that operates the motor car is applied to the motor 30 so as to turn the shaft 29, thus rotating the screw shaft 6.

In operation, rotation of the screw shaft 6 causes the shoes 19 to travel first in one direction and then in the opposite direction and, in this instance, each wiper bar will be caused to traverse one-half of the length of the windshield, each wi rbar operating from one end of the winddl i ield to approximately the middle thereof and then back.

again to the end.

Other power than the vacuum operated motor may be utilized, if desired, to turn the screw shaft and, it will be noted, that because of the requirement that the motor 30 operate in one direction only, said motor may .be more simply constructed than a motor that operates alternately in opposite directions, as is necessary with a large number of windshield wipers at present in use.

In the instance shown in the drawings,.the screw shaft bearings 31 are 'connecte with the frame member B of the windshield by threaded studs '32 and nuts 33. The motor 30 is secured to the frame member 13 by bolts 34.

I claim:

1. A wind shield wier comprising a. sectional shaft, some of te shaft sections having right and left screw threads, the end sections having grooves connecting the adjacent ends of the screw threads, a coupling means for each two adjacent shaft sections, :1. shoe, means to hold the shoe engaged with the threads as the shaft turns, a wiper bar connected with the shoe, means to rotatably support the shaft on a wind shield, a motor means to secure the motor to said wind sh eld, and driving gearing connecting the motor with the. shaft.

2. A wind shield wiper comprising a sectional shaft, some of the shaft sections having' right and left screw threads, the end sections and another section interposed between two of the first mentioned sections having grooves connecting the adjacent ends of the screw threads of adjacent sections, a coupling means for each two adjacent shaft sections, a shoe, means to hold'theshoe en gaged with the threads as the wipor'bar connected with the shoe, means to rotatably support the shaft on a wind shield, a motor, means to secure the motor tosaid wind shield, and driving gearing connecting the motor with the shaft.

3. A windshield wipor'comprising a sectional shaft including end sections and a center section between the end sections, means for interconnecting said sections, the center section having right and left screw threads and the end sections having grooves eonnecting adjacent ends of the screw threads, 9. shoe engaging the threads of the shaft sections, a wiper connected with the shoe, means to rotatably support the shaft on a windshield, and. power means associated with the shaft for rotating the'same.

4. A windshield wiper comprising'a right and left threaded screw shaft, non-threaded bearing extensions detachably associated with the opposite ends ofthe Shafiabearin associated with said extensions for rotatab y mounting the shaft on a windshield and for holding the same from endwise movement, a shoe engaging the threads of-the shaft, :1. wiper bar connected with the shoe, and power means associated with the shaft for imparting rotation thereto.

5. A windshield wiper comprising a see- I tional shaft including tubular end sections and a. tubular section between the end sections, one section having 'right and left hand screw threads, and the end sections having grooves connecting the adjacent ends of the,

screw threads, means received within and extending beyond the ends of the tubular sections for detachably connecting said sections to rotatc in unison and for extending beyond the end sections toprovide bearing extensions, means cooperating with said bearing extensions for rotatably mounting said shaft on a windshield'and holding the same from endwise movement, a shoe. engaging the threads of the shaft, a wiperbar connected with the shoe, and power means associated with the shaft for imparting ro-V tation thereto.

shaft turns, a

Signed at Los Angeles, California, this 7 30th day of August 1926.

HOWARD E, MARSH. 

